a
FEATURES
On-Chip Reference and Track/Hold
On-Chip Input Buffer
850 mW Typical Power Dissipation at 105 MSPS
500 MHz Analog Bandwidth
SNR = 67 dB @ 49 MHz AIN at 105 MSPS
SFDR = 80 dB @ 49 MHz AIN at 105 MSPS
2.0 V p-p Differential Analog Input Range
Single 5.0 V Supply Operation
3.3 V CMOS/TTL Outputs
Two’s Complement Output Format
APPLICATIONS
Communications
Basestations and
‘Zero-IF’
Subsystems
Wireless Local Loop (WLL)
Local Multipoint Distribution Service (LMDS)
HDTV Broadcast Cameras and Film Scanners
12-Bit, 80 MSPS/105 MSPS
A/D Converter
AD9432
FUNCTIONAL BLOCK DIAGRAM
V
CC
V
DD
AIN
AIN
ENCODE
ENCODE
PIPELINE
ADC
12
OUTPUT
STAGING
12
D11–D0
OR
BUF
T/H
TIMING
REF
AD9432
GND
VREFOUT VREFIN
GENERAL INTRODUCTION
The AD9432 is a 12-bit monolithic sampling analog-to-digital
converter with an on-chip track-and-hold circuit and is optimized
for high-speed conversion and ease of use. The product operates
at a 105 MSPS conversion rate with outstanding dynamic per-
formance over its full operating range.
The ADC requires only a single 5.0 V power supply and a
105 MHz encode clock for full-performance operation. No
external reference or driver components are required for many
applications. The digital outputs are TTL/CMOS compatible
and a separate output power supply pin supports interfacing
with 3.3 V logic. The encode input supports either differential
or single-ended and is TTL/CMOS-compatible.
Fabricated on an advanced BiCMOS process, the AD9432 is
available in a 52-lead plastic quad flatpack package (LQFP)
specified over the industrial temperature range (–40°C to +85°C).
REV. E
Information furnished by Analog Devices is believed to be accurate and
reliable. However, no responsibility is assumed by Analog Devices for its
use, nor for any infringements of patents or other rights of third parties that
may result from its use. No license is granted by implication or otherwise
under any patent or patent rights of Analog Devices.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700
www.analog.com
Fax: 781/326-8703
© Analog Devices, Inc., 2002
AD9432–SPECIFICATIONS
Parameter
RESOLUTION
DC ACCURACY
Differential Nonlinearity
Integral Nonlinearity
No Missing Codes
Gain Error
1
Gain Tempco
1
ANALOG INPUT
Input Voltage Range (AIN–AIN)
Common-Mode Voltage
Input Offset Voltage
Input Resistance
Input Capacitance
Analog Bandwidth, Full Power
ANALOG REFERENCE
Output Voltage
Tempco
Input Bias Current
SWITCHING PERFORMANCE
Maximum Conversion Rate
Minimum Conversion Rate
Encode Pulsewidth High (t
EH
)
Encode Pulsewidth Low (t
EL
)
Aperture Delay (t
A
)
Aperture Uncertainty (Jitter)
Output Valid Time (t
V
)
2
Output Propagation Delay (t
PD
)
2
Output Rise Time (t
R
)
2
Output Fall Time (t
F
)
Out-of-Range Recovery Time
Transient Response Time
Latency
DIGITAL INPUTS
Encode Input Common Mode
Differential Input (ENC–ENC)
Single-Ended
Logic “1” Voltage
Logic “0” Voltage
Input Resistance
Input Capacitance
DIGITAL OUTPUTS
Logic “1” Voltage (V
DD
= 3.3 V)
Logic “0” Voltage (V
DD
= 3.3 V)
Output Coding
POWER SUPPLY
Power Dissipation
3
Power Supply Rejection Ratio (PSRR)
I
VCC
I
VDD
25°C
Full
25°C
Full
Full
25°C
Full
Full
Full
Full
Full
25°C
25°C
Full
Full
Full
Full
Full
25°C
25°C
25°C
25°C
Full
Full
Full
Full
25°C
25°C
Full
Full
Full
Full
Full
Full
25°C
Full
Full
Temp
(V
DD
= 3.3 V, V
CC
= 5.0 V; external reference; differential encode input, unless
otherwise noted.)
Test
Level
AD9432BST/BSQ-80
Min
Typ
Max
12
I
VI
I
VI
VI
I
V
V
V
VI
VI
V
V
VI
V
VI
VI
IV
IV
IV
V
V
VI
VI
V
V
V
V
IV
V
V
IV
IV
VI
V
VI
VI
2.0
3
5
4.5
0.8
8
–0.75
±
0.25
–1.0
±
0.5
–1.0
±
0.5
–1.5
±
1.0
Guaranteed
–5
+2
150
±
1.0
3.0
±
0
3
4
500
2.5
50
15
+0.75
+1.0
+1.0
+1.5
+7
–0.75
–1.0
–1.0
–1.5
–5
AD9432BST/BSQ-105
Min
Typ
Max
12
±
0.25
±
0.5
±
0.5
±
1.0
Guaranteed
+2
150
±
1.0
3.0
±
0
3
4
500
2.5
50
15
+0.75
+1.0
+1.0
+1.5
+7
Unit
Bits
LSB
LSB
LSB
LSB
% FS
ppm/°C
V
V
mV
kΩ
pF
MHz
V
ppm/°C
µΑ
MSPS
MSPS
ns
ns
ns
ps rms
ns
ns
ns
ns
ns
ns
Cycles
V
mV
V
V
kΩ
pF
V
V
–5
2
+5
4
–5
2
+5
4
2.4
2.6
50
2.4
2.6
50
80
1
4.0
4.0
6.2
6.2
2.0
0.25
5.3
5.5
2.1
1.9
2
2
10
1.6
750
105
1
4.0
4.0
4.8
4.8
2.0
0.25
5.3
5.5
2.1
1.9
2
2
10
1.6
750
2.0
3
5
4.5
0.8
8
3.0
3.0
8.0
8.0
V
DD
– 0.05
0.05
Two’s Complement
790
+0.5
158
9.5
1000
+5
200
12.2
V
DD
– 0.05
0.05
Two’s Complement
850
+0.5
170
12.5
1100
+5
220
16
Full
25°C
Full
Full
VI
I
VI
VI
–5
–5
mW
mV/V
mA
mA
–2–
REV. E
AD9432
Parameter
DYNAMIC PERFORMANCE
4
Signal-to-Noise Ratio (SNR)
(Without Harmonics)
f
IN
= 10.3 MHz
f
IN
= 40 MHz
f
IN
= 49 MHz
f
IN
= 70 MHz
Signal-to-Noise Ratio (SINAD)
(With Harmonics)
f
IN
= 10.3 MHz
f
IN
= 40 MHz
f
IN
= 49 MHz
f
IN
= 70 MHz
Effective Number of Bits
f
IN
= 10 MHz
f
IN
= 40 MHz
f
IN
= 49 MHz
f
IN
= 70 MHz
Second and Third Harmonic Distortion
f
IN
= 10 MHz
f
IN
= 40 MHz
f
IN
= 49 MHz
f
IN
= 70 MHz
Worst Harmonic or Spur
(Excluding Second and Third)
f
IN
= 10 MHz
f
IN
= 40 MHz
f
IN
= 49 MHz
f
IN
= 70 MHz
Two-Tone Intermod Distortion (IMD)
f
IN1
= 29.3 MHz; f
IN2
= 30.3 MHz
f
IN1
= 70.3 MHz; f
IN2
= 71.3 MHz
Temp
Test
Level
AD9432BST/BSQ-80
Min
Typ
Max
AD9432BST/BSQ-105
Min
Typ
Max
Unit
25°C
25°C
25°C
25°C
I
I
I
V
65.5
65
67.5
67.2
67.0
66.1
65.5
64
67.5
67.2
67.0
66.1
dB
dB
dB
dB
25°C
25°C
25°C
25°C
25°C
25°C
25°C
25°C
25°C
25°C
25°C
25°C
I
I
I
V
V
V
V
V
I
I
I
V
65
64.5
67.2
66.9
66.7
65.8
11.0
10.9
10.9
10.7
65
63
67.2
66.9
66.7
65.8
11.0
10.9
10.9
10.7
dB
dB
dB
dB
Bits
Bits
Bits
Bits
dBc
dBc
dBc
dBc
–75
–73
–85
–85
–83
–80
–75
–72
–85
–83
–80
–78
25°C
25°C
25°C
25°C
25°C
25°C
I
I
I
V
V
V
–80
–80
–90
–90
–90
–90
–75
–66
–80
–80
–90
–90
–90
–90
–75
–66
dBc
dBc
dBc
dBc
dBc
dBc
NOTES
1
Gain error and gain temperature coefficients are based on the ADC only (with a fixed 2.5 V external reference and a 2 V p-p differential analog input).
2
t
V
and t
PD
are measured from the transition points of the ENCODE input to the 50%/50% levels of the digital outputs swing. The digital output load during test is
not to exceed an ac load of 10 pF or a dc current of
±
40
µA.
Rise and fall times measured from 10% to 90%.
3
Power dissipation measured with encode at rated speed and a dc analog input. (Outputs Static, I
VDD
= 0.)
4
SNR/harmonics based on an analog input voltage of –0.5 dBFS referenced to a 2 V full-scale input range.
Specifications subject to change without notice.
REV. E
–3–
AD9432
ABSOLUTE MAXIMUM RATINGS*
THERMAL CHARACTERISTICS
V
DD
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 V
V
CC
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 V
Analog Inputs . . . . . . . . . . . . . . . . . . . –0.5 V to V
CC
+ 0.5 V
Digital Inputs . . . . . . . . . . . . . . . . . . . –0.5 V to V
DD
+ 0.5 V
VREFIN . . . . . . . . . . . . . . . . . . . . . . . –0.5 V to V
CC
+ 0.5 V
Digital Output Current . . . . . . . . . . . . . . . . . . . . . . . . 20 mA
Operating Temperature . . . . . . . . . . . . . . . . –55°C to +125°C
Storage Temperature . . . . . . . . . . . . . . . . . . –65°C to +150°C
Maximum Junction Temperature . . . . . . . . . . . . . . . . 150°C
Maximum Case Temperature . . . . . . . . . . . . . . . . . . . 150°C
*Stresses
above those listed under Absolute Maximum Ratings may cause perma-
nent damage to the device. This is a stress rating only; functional operation of the
device at these or any other conditions outside of those indicated in the operation
sections of this specification is not implied. Exposure to absolute maximum
ratings for extended periods may affect device reliability.
52-Lead Plastic LQFP (ST-52)
JA
= 50°C/W, No Airflow
52-lead PowerQuad
®
4 LQFP (SQ-52)
JA
= 25°C/W, Soldered Exposed Heat Sink, No Airflow
JA
= 33°C/W, Unsoldered Exposed Heat Sink, No Airflow
JC
= 2°C/W, Bottom of package (Exposed Heat Sink)
Simulated Typical performance for 4-layer JEDEC board,
horizontal orientation.
ORDERING GUIDE
Model
AD9432BSQ
-80, -105
Temperature
Ranges
–40°C to +85°C
Package
Descriptions
Package
Option
EXPLANATION OF TEST LEVELS
Test Level
I
II
100% production tested.
100% production tested at 25°C and sample tested at
specified temperatures.
AD9432BST –40°C to +85°C
-80, -105
AD9432/PCB 25°C
52-Lead Thermally
SQ-52
Enhanced Plastic
Quad Flatpack
52-Lead Plastic Quad ST-52
Flatpack (LQFP)
Evaluation Board
III Sample tested only.
IV Parameter is guaranteed by design and characterization
testing.
V
Parameter is a typical value only.
VI 100% production tested at 25°C; guaranteed by design and
characterization testing for industrial temperature range.
CAUTION
ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily
accumulate on the human body and test equipment and can discharge without detection.
Although the AD9432 features proprietary ESD protection circuitry, permanent damage may
occur on devices subjected to high-energy electrostatic discharges. Therefore, proper ESD
precautions are recommended to avoid performance degradation or loss of functionality.
WARNING!
ESD SENSITIVE DEVICE
PowerQuad is a registered trademark of AMkor Technology, Inc.
–4–
REV. E
AD9432
PIN CONFIGURATION
VREFOUT
VREFIN
V
CC
GND
GND
V
CC
GND
V
CC
DNC
GND
39
GND
38
GND
37
V
CC
36
V
CC
35
GND
34
GND
33
GND
32
V
DD
31
DGND
30
D0 (LSB)
29
D1
28
D2
27
D3
14 15 16 17 18 19 20 21 22 23 24 25 26
V
CC
52 51 50 49 48 47 46 45 44 43 42 41 40
GND
1
V
CC 2
GND
3
GND
4
V
CC 5
V
CC 6
ENCODE
7
ENCODE
8
GND
9
V
CC 10
GND
11
DGND
12
V
DD 13
PIN 1
IDENTIFIER
AIN
AIN
AD9432
TOP VIEW
(Not to Scale)
(MSB) D11
OR
D5
D10
D9
D8
D7
D6
DGND
PIN FUNCTION DESCRIPTIONS
Pin Number (AD9432BST)
1, 3, 4, 9, 11, 33, 34, 35, 38, 39, 40, 43, 48, 51
2, 5, 6, 10, 36, 37, 42, 44, 47, 52
7
8
14
15–20, 25–30
12, 21, 24, 31
13, 22, 23, 32
41
45
46
49
50
DEFINITION OF SPECIFICATIONS
Mnemonic
GND
V
CC
ENCODE
ENCODE
OR
D11–D6, D5–D0
DGND
V
DD
DNC
VREFIN
VREFOUT
AIN
AIN
Function
Analog Ground
Analog Supply (5 V)
Encode Clock for ADC–Complementary
Encode Clock for ADC–True (ADC samples on rising edge of ENCODE)
Out of Range Output
Digital Output
Digital Output Ground
Digital Output Power Supply (2.7 V to 3.6 V)
Do Not Connect
Reference Input for ADC (2.5 V Typical); Bypass with 0.1
µF
to Ground.
Internal Reference Output (2.5 V Typical)
Analog Input–True
Analog Input–Complementary
Minimum Conversion Rate
Analog Bandwidth (Small Signal)
The analog input frequency at which the spectral power of the
fundamental frequency (as determined by the FFT analysis) is
reduced by 3 dB.
Aperture Delay
The delay between a differential crossing of ENCODE and
ENCODE
and the instant at which the analog input is sampled.
Aperture Uncertainty (Jitter)
The encode rate at which the SNR of the lowest analog signal
frequency drops by no more than 3 dB below the guaranteed limit.
Maximum Conversion Rate
The encode rate at which parametric testing is performed.
Output Propagation Delay
The delay between a differential crossing of ENCODE and
ENCODE
and the time when all output data bits are within
valid logic levels.
Power Supply Rejection Ratio
The sample-to-sample variation in aperture delay.
Differential Nonlinearity
The deviation of any code from an ideal 1 LSB step.
Encode Pulsewidth/Duty Cycle
The ratio of a change in input offset voltage to a change in
power supply voltage.
Signal-to-Noise Plus Distortion (SINAD)
Pulsewidth high is the minimum amount of time that the ENCODE
pulse should be left in Logic “1” state to achieve rated performance;
pulsewidth low is the minimum time ENCODE pulse should be left
in low state. At a given clock rate, these specs define an acceptable
Encode duty cycle.
Integral Nonlinearity
The ratio of the rms signal amplitude (set at 1 dB below full
scale) to the rms value of the sum of all other spectral compo-
nents, including harmonics but excluding dc.
Signal-to-Noise Ratio (SNR)
The deviation of the transfer function from a reference line
measured in fractions of 1 LSB using a “best straight line”
determined by a least square curve fit.
REV. E
–5–
The ratio of the rms signal amplitude (set at 1 dB below full
scale) to the rms value of the sum of all other spectral compo-
nents, excluding the first five harmonics and dc.
DGND
V
DD
V
DD
D4
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